qa: tweak pmda install check_delay to stop flappy failures
qa: tweak pmda install check_delay to stop flappy failures

A couple of pmdasimple tests are proving non-deterministic
with the 300ms metric verification check delay - originally
was 3sec, but reduced to speed up Install.  Push the needle
back to 1sec, seems reliable for all cases now.

wuliming/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp